{"id":"CVE-2026-19023","summary":"HDF5 h5dump Untrusted Pointer Dereference in Binary Output of Variable-Length String Datasets","details":"Untrusted pointer dereference in the render_bin_output function in the h5dump tool in HDF5 before 2.3.0 allows attackers to cause a denial of service via a variable-length string dataset with more than one element dumped in binary mode, which corrupts the per-element stride calculation and causes subsequent elements to be read from a misaligned offset and dereferenced as a pointer.","modified":"2026-08-07T11:50:28.896030282Z","published":"2026-08-05T22:13:45.859Z","database_specific":{"osv_generated_from":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/19xxx/CVE-2026-19023.json","unresolved_ranges":[{"extracted_events":[{"last_affected":"2.3.0"}],"source":"AFFECTED_FIELD"},{"source":"DESCRIPTION","extracted_events":[{"introduced":"HDF5"},{"fixed":"2.3.0"}]}],"cna_assigner":"HDFG","cwe_ids":["CWE-822"]},"references":[{"type":"ADVISORY","url":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/19xxx/CVE-2026-19023.json"},{"type":"ADVISORY","url":"https://nvd.nist.gov/vuln/detail/CVE-2026-19023"},{"type":"REPORT","url":"https://github.com/HDFGroup/hdf5/issues/6486"}],"affected":[{"ranges":[{"type":"GIT","repo":"https://github.com/hdfgroup/hdf5","events":[{"introduced":"577c192518598c7e2945683655feffcdbdf5a91b"},{"fixed":"4fde4fd787744b6a19b12032f4dad0383fbe6fbd"}],"database_specific":{"extracted_events":[{"introduced":"HDF5"},{"fixed":"2.1.1"}],"source":"DESCRIPTION"}}],"database_specific":{"source":"https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2026-19023.json"}}],"schema_version":"1.8.0","severity":[{"type":"CVSS_V4","score":"CVSS:4.0/AV:L/AC:L/AT:N/PR:N/UI:P/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N"}]}